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Fix SevenZipReader to iterate entries as contiguous streams

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Co-authored-by: adamhathcock <527620+adamhathcock@users.noreply.github.com>
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copilot-swe-agent[bot]
2026-01-27 17:01:18 +00:00
parent 72eaf66f05
commit db2f5c9cb9
3 changed files with 79 additions and 11 deletions
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54
src/SharpCompress/Archives/SevenZip/SevenZipArchive.cs
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@@ -216,6 +216,9 @@ public class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, SevenZipVol
{
private readonly SevenZipArchive _archive;
private SevenZipEntry? _currentEntry;
private Stream? _currentFolderStream;
private CFolder? _currentFolder;
private int _currentFolderIndex = -1;
internal SevenZipReader(ReaderOptions readerOptions, SevenZipArchive archive)
: base(readerOptions, ArchiveType.SevenZip) => this._archive = archive;
@@ -231,9 +234,10 @@ public class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, SevenZipVol
_currentEntry = dir;
yield return dir;
}
// For non-directory entries, yield them without creating shared streams
// Each call to GetEntryStream() will create a fresh decompression stream
// to avoid state corruption issues with async operations
// For solid archives (entries in the same folder share a compressed stream),
// we must iterate entries sequentially and maintain the folder stream state
// across entries in the same folder to avoid recreating the decompression
// stream for each file, which breaks contiguous streaming.
foreach (var entry in entries.Where(x => !x.IsDirectory))
{
_currentEntry = entry;
@@ -243,19 +247,47 @@ public class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, SevenZipVol
protected override EntryStream GetEntryStream()
{
// Create a fresh decompression stream for each file (no state sharing).
// However, the LZMA decoder has bugs in its async implementation that cause
// state corruption even on fresh streams. The SyncOnlyStream wrapper
// works around these bugs by forcing async operations to use sync equivalents.
//
// TODO: Fix the LZMA decoder async bugs (in LzmaStream, Decoder, OutWindow)
// so this wrapper is no longer necessary.
var entry = _currentEntry.NotNull("currentEntry is not null");
if (entry.IsDirectory)
{
return CreateEntryStream(Stream.Null);
}
return CreateEntryStream(new SyncOnlyStream(entry.FilePart.GetCompressedStream()));
var folder = entry.FilePart.Folder;
// Check if we're starting a new folder - dispose old folder stream if needed
if (folder != _currentFolder)
{
_currentFolderStream?.Dispose();
_currentFolderStream = null;
_currentFolder = folder;
_currentFolderIndex = _archive._database!._folders.IndexOf(folder!);
}
// Create the folder stream once per folder
if (_currentFolderStream is null)
{
_currentFolderStream = _archive._database!.GetFolderStream(
_archive.Volumes.Single().Stream,
folder!,
_archive._database.PasswordProvider
);
}
// Wrap with SyncOnlyStream to work around LZMA async bugs
// Return a ReadOnlySubStream that reads from the shared folder stream
return CreateEntryStream(
new SyncOnlyStream(
new ReadOnlySubStream(_currentFolderStream, entry.Size, leaveOpen: true)
)
);
}
public override void Dispose()
{
_currentFolderStream?.Dispose();
_currentFolderStream = null;
base.Dispose();
}
}